mirror of
https://github.com/torvalds/linux.git
synced 2024-12-04 18:13:04 +00:00
16c138f338
Add a simple program that allows to retrieve chip properties from the GPIO character device. This will be used in gpio-sim selftests. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
58 lines
1.2 KiB
C
58 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* GPIO character device helper for reading chip information.
|
|
*
|
|
* Copyright (C) 2021 Bartosz Golaszewski <brgl@bgdev.pl>
|
|
*/
|
|
|
|
#include <fcntl.h>
|
|
#include <linux/gpio.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/types.h>
|
|
|
|
static void print_usage(void)
|
|
{
|
|
printf("usage:\n");
|
|
printf(" gpio-chip-info <chip path> [name|label|num-lines]\n");
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
struct gpiochip_info info;
|
|
int fd, ret;
|
|
|
|
if (argc != 3) {
|
|
print_usage();
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
fd = open(argv[1], O_RDWR);
|
|
if (fd < 0) {
|
|
perror("unable to open the GPIO chip");
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
memset(&info, 0, sizeof(info));
|
|
ret = ioctl(fd, GPIO_GET_CHIPINFO_IOCTL, &info);
|
|
if (ret) {
|
|
perror("chip info ioctl failed");
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
if (strcmp(argv[2], "name") == 0) {
|
|
printf("%s\n", info.name);
|
|
} else if (strcmp(argv[2], "label") == 0) {
|
|
printf("%s\n", info.label);
|
|
} else if (strcmp(argv[2], "num-lines") == 0) {
|
|
printf("%u\n", info.lines);
|
|
} else {
|
|
fprintf(stderr, "unknown command: %s\n", argv[2]);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|